Daytona back from service, ran very accurately for a month then lost 4 min. overnight

[the dark knight]

Originally Posted by ratty

Try winding it up once a week and see if that makes any difference.

+1

Whenever something like that has happened to me, it was always a PR issue. OP, not sure about your lifestyle, but I think a lot of typical office job people these days overestimate the "movement" their watches get over the course of a day.